halstead ace water dripping from group set by dhw switch

[cmp260]

Anyone know if there are replaceable seals to go around that little pin that pushes out from the group set upon dhw demand and turns on a burner switch

? I have droplets of water coming out and regularly shorting out the switch which strangely doesn't cause the boiler to fail but does cause the hot water light to come on and the burner -which is not good -presumably.

I have cranked surrounding nut tight and still leaks. If there are seals, what are they called and where could I buy them? Are they diverter shaft seals?

many thanks in advance.

 

[fanboy]

They are usually referred to as pin seals, usually not listed with part numbers in manufacturers instructions. It would be better if you had the make and model of your boiler, preferably with the gc number. Then phone the manufacturers spares line to identify the part number.

DO NOT tighten the nut, in most cases it will make the leak worse.

 

[Agile]

There is a rubber "O" ring seal INSIDE the nut part.

Cost about £9 posted.

They leak because the water was not cleaned properly.

When replacing you must totally clean the pin of all stuck on dirt or the new seal will be spoilt again soon.

I am surprised you think its odd when water makes the DHW switch create a ( false ) demand for DHW as thats its purpose.

Tony

 

[ollski]

you won't get it as a halstead spare part but you will get it as a spare for a glow-worm / sd 30e. The brass diaphragm housing cover is about a tenner, just whip the seal off and stick it on yours. Best to do it fairly quick as it will find its way into the microswitch and cause a permanent failure of that.

 

[cmp260]

> am surprised you think its odd when water makes the DHW switch create a ( false ) demand for DHW as thats its purpose. <

What I actually thought was odd is the boiler not realizing someting was wrong and tripping because the burner is on but no actual heat or dhw demand.

What is happening? Since the switch shorted it caused the burner to come on but the diverter is not activated to divert/make hot water. Presumably this means heat from the burner is being used for heating even thought the thermostat is off?

many thanks all for the useful replies.

 

[Agile]

I am a little confused now by Ollski.

I thought that the Ace had a common mechanically operated diverter with brass bits whereas the G-W SD30E had plastic bits and a motor diverter although he mentions a brass housing as if the pin seal is part of the housing rather than the screw in seal in the centre.

The seal I envisage is better known as a Biasi spare part.

Lets assume I am right then and the Ace has a mechnically operated diverter.

If the DHW demand switch is operated then the boiler will fire up and produce heat which will go to the rads. But you dont seem to have noticed that.

The boiler will still be temperature controlled ( to DHW specs ) so will not lock out.

Tony

 

[ollski]

Glow worm compact I meant to say isn't that the one that's rebadged a saunier duval 30e?